A 600 mm square interior column, reinforced with eight No.25 bars of Grade 420, supports a dead load of 866 KN and a live load of 577.33 KN. Assume that a live load reduction of 30% may be allowed at foundation level. The foundation is to be placed at a depth of 1m where the allowable bearing capacity is 110 KPa. The average density of the backfill material and the

A 600 mm square interior column, reinforced with eight No.25 bars of Grade 420, supports a dead load of 866 KN and a live load of 577.33 KN. Assume that a live load reduction of 30% may be allowed at foundation level. The foundation is to be placed at a depth of 1m where the allowable bearing capacity is 110 KPa. The average density of the backfill material and the

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Design criteria for structural loading

The different loads such as loads due to self-weight (dead load) and external loads such as live load, wind loads, seismic load, snow load, and other loads and load combinations that influence the design of a building are called structural loading. The nature of the applied load differs from changes in the location, design, and type of materials used. The design criteria require that structures must be designed and constructed to be able to withstand all load types that are expected to act upon the structure and render its usage for the designated purpose. The structural members such as beams, slabs, columns, and foundations help the structure to withstand the applied load. There are different institutes such as ASCE and ACI that provide building design codes to assure minimum safety requirements and quality of the structures.

Question

Footing

A 600 mm square interior column, reinforced with eight No.25
bars of Grade 420, supports a dead load of 866 KN and a live
load of 577.33 KN. Assume that a live load reduction of 30%
may be allowed at foundation level. The foundation is to be
placed at a depth of 1m where the allowable bearing capacity
is 110 kPa. The average density of the backfill material and the
footing concrete together may be taken as 2100 Kg/Cu.m,
while the filling from ground to plinth level is to be 0.5m of
material with average density of 1900 Kg/Cu.m. Design a
square footing using fc'=20 MPa, fy for foundation steel=300
MPa and fy for dowel steel=420 MPa.

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Step 1: Given Data:

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Step 2: Calculate the load on the footing.

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Step 3: Calculate the size of footing

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Step 4: Calculate the net upward pressure intensity.

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Step 5: Calculate the depth of the footing.

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Step 6: Calculate the reinforcement.

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